Tilted Forum Project Discussion Community  

Go Back   Tilted Forum Project Discussion Community > The Academy > Tilted Knowledge and How-To


 
 
LinkBack Thread Tools
Old 12-11-2004, 04:18 PM   #1 (permalink)
Registered User
 
Furnace not working

The furnace for my main floor isn't working right. It's about 6 years old. There's a small blower that's running nonstop, but the main blower never kicks on.

Since it's newer there's no pilot light. A pal thinks it's the electric ignitor that's bad. It's not working so the gas never runs and the blower never goes.

The model is Heil.
pook is offline  
Old 12-11-2004, 06:42 PM   #2 (permalink)
Junkie
 
eribrav's Avatar
 
Location: upstate NY
There's some projects I'm willing to tackle, but the furnace generally isn't one of them. There's just too much possibility of catastrophic error involving nat gas, carbon monoxide, etc. I'd get a professional in. Sure that will be expensive over the weekend but well worth it in the long run.
eribrav is offline  
Old 12-12-2004, 10:39 AM   #3 (permalink)
Détente
 
Bossnass's Avatar
 
Location: AWOL in Edmonton
Is the hot-point ignitor trying to click on. A period 'snap' will indicate that it is. If so, the ignitor may be good and you don't have gas/ have an apature problem. If it isn't, then it is probably the problem, which is an easy fix.

Either way, it is probably the best course of action to get a professional in. I always get this darwin alarm going off in the back of my head whenever I'm doing anything where NG is involved.
Bossnass is offline  
Old 12-12-2004, 11:35 PM   #4 (permalink)
Psycho
 
Location: Where the night things are
The small fan that is running is called a draft inducer blower. It is the first device ordered to start by the control board upon a call for heat by the thermostat. One problem with the units of that vintage is that all the little kinks of meduim-high efficiency weren't worked out. From that draft blower is a piece of soft tubing that loops over to a diaphragm with a microswitch on it. Pull the tubing off the diaphragm (you don't need to shut anything off) and hold it down from the blower. Expect a half-teaspoon of water to come out. Reattach the hose to the diaphragm, and there should be an almost immediate 'click' as the diaphragm verifies blower operation and closes the switch. Once that switch closes, the hot surface igniter is energized, heat feedback authorizes pilot, cad cell eye verifies pilot, main flow gas is authorized, and main burner fires. Hot surface igniter is de-energized, and cad cell eye monitors main burner and will cut off gas if flame fails, rollout heat sensor activates, high limit safety activates, or blockage occurs in the flue, which would cause the diaphragm switch to open. Otherwise, once the heat exchanger is warmed, the main fan will come on and you'll have heat until the thermostat is satisfied.
__________________
There ain't nothin' more powerful than the odor of mendacity -Big Daddy
kazoo is offline  
Old 12-12-2004, 11:42 PM   #5 (permalink)
Psycho
 
Location: Where the night things are
Just in case you haven't tried to get to anything yet, assuming the unit to be an ordinary Heil vertical updraft furnace, the fan that you hear and the hose that you need to get to are behind the upper louvered access panel that you're staring at when you approach the heater. Lift up about a half inch and the panel should come off. Don't play with the solid panel beneath it unless you have to. That panel must be reinstalled correctly or the main safety switch will lock out and nada will run. :no heat smiley:
__________________
There ain't nothin' more powerful than the odor of mendacity -Big Daddy
kazoo is offline  
Old 12-13-2004, 08:17 AM   #6 (permalink)
Insane
 
Locke7's Avatar
 
Wow that was technical. Think we have a furnace guy here on the forums.

I'm no furnace guy, but I had the same problem, TWICE. And all you guys talk about darwin awards is a good point. The more I look back, the worse I feel. One wrong move and I could have been toast, literally.

But I'm a DIY guy so I had to try, and it worked both times. So here goes, very non technical description of what I did.

First time, draft inducer blower (heh, picked that up from kazoo) would turn on, glow plug would light up, gas would turn, and furnace would function for about 10 seconds, then just turn off. It would try this about ever 2 minutes. It ended up being the flame monitor (maybe the cad cell eye in kazoo's post??). It is a small cylinder that is up in one of the flames. It was dirty. They said to clean it off with an emery cloth, so I used one of my wifes emery boards. Worked like a champ.

Second time, draft inducer blower would fire up, but glow plug would never turn on. Took it out and realized that it had a crack in it, got a new one from a local utility place, installed it, and everything went back to working.

This thing breaks down one more time, I'm calling a pro.
Locke7 is offline  
Old 12-13-2004, 04:10 PM   #7 (permalink)
MSD
The sky calls to us ...
 
MSD's Avatar
 
Super Moderator
Location: CT
Quote:
Originally Posted by kazoo
The small fan that is running is called a draft inducer blower. It is the first device ordered to start by the control board upon a call for heat by the thermostat. One problem with the units of that vintage is that all the little kinks of meduim-high efficiency weren't worked out. From that draft blower is a piece of soft tubing that loops over to a diaphragm with a microswitch on it. Pull the tubing off the diaphragm (you don't need to shut anything off) and hold it down from the blower. Expect a half-teaspoon of water to come out. Reattach the hose to the diaphragm, and there should be an almost immediate 'click' as the diaphragm verifies blower operation and closes the switch. Once that switch closes, the hot surface igniter is energized, heat feedback authorizes pilot, cad cell eye verifies pilot, main flow gas is authorized, and main burner fires. Hot surface igniter is de-energized, and cad cell eye monitors main burner and will cut off gas if flame fails, rollout heat sensor activates, high limit safety activates, or blockage occurs in the flue, which would cause the diaphragm switch to open. Otherwise, once the heat exchanger is warmed, the main fan will come on and you'll have heat until the thermostat is satisfied.
Wow. That was educational. I was just going to tell him to call a repairman so he doesn't blow himself up.
MSD is offline  
Old 12-13-2004, 05:47 PM   #8 (permalink)
Psycho
 
Location: Where the night things are
Always glad to help. Emails are welcome, too. Fixin' stuff is what I do.
__________________
There ain't nothin' more powerful than the odor of mendacity -Big Daddy
kazoo is offline  
 

Tags
furnace, working

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 12:00 PM.

Tilted Forum Project

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
© 2002-2012 Tilted Forum Project

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360